<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>axios+vue</title>
  </head>
  <body>
    <div id="app">
      <input type="button" value="一个笑话" @click="getJoke" />
      <p>{{joke}}</p>
    </div>
    <!-- 官网提供的axios在线地址 -->
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      /*
            接口:随机获取一条笑话
            请求地址:https://autumnfish.cn/api/joke
            请求方法:get
            请求参数:无
            响应内容:随机笑话
        */
      var app = new Vue({
        el: "#app",
        data: {
          joke: "这是一个笑话",
        },
        methods: {
          getJoke: function () {
            console.log(this.joke); //这是一个笑话
            var that = this;
            axios.get("https://autumnfish.cn/api/joke").then(
              function (response) {
                // console.log(response.data);
                console.log(this.joke); //undefined
                that.joke = response.data;
              },
              function (error) {
                console.log(error);
              }
            );
          },
        },
      });
    </script>
  </body>
</html>
